. Bulletin. Natural history; Natural history. August, 1957 Larimore: Life History of the Warmouth 53 combined and are not shown separately; however, consistency in calculated lengths of fish of the same and of different age groups is shown in tables 21 and 26. 4. There was similarity among war- mouths of different year classes with re- spect to growth rates in certain calendar years, tables 23 and 24. Characteristics of the Annulus.— The true annulus on the warmouth scale appears as a result of resumption of growth of bodv and scales after the cessa- tion of growth during winter months. True a
. Bulletin. Natural history; Natural history. August, 1957 Larimore: Life History of the Warmouth 53 combined and are not shown separately; however, consistency in calculated lengths of fish of the same and of different age groups is shown in tables 21 and 26. 4. There was similarity among war- mouths of different year classes with re- spect to growth rates in certain calendar years, tables 23 and 24. Characteristics of the Annulus.— The true annulus on the warmouth scale appears as a result of resumption of growth of bodv and scales after the cessa- tion of growth during winter months. True annuli or year-marks usually show several rather definite characteristics, fig. 18. Across the anterior field of the scale the annulus appears as a break in the arrange- ment of circuli; it is bordered on the in- side by closely spaced, incomplete circuli and on the outside by complete, widely spaced circuli. The radii in the anterior field are slightly distorted in the region of the annulus. On the lateral fields of the scale, the annulus and newly formed circuli. Fig. 18.—Warmouth scale: A, wide spacing of circuli especially evident following resurnp- tion of growth in spring; B, first annulus; C, second annulus; D, crowding of circuli during period of slow growth resulting from habitat disturbance ; E, new circuli cutting across ends of circuli laid down in previous Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Illinois. Natural History Survey Division. Urbana, State of Illinois, Dept. of Registration and Education, Natural History Survey Division
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Keywords: ., booka, bookcentury1900, bookdecade1910, booksubjectnaturalhistory
